20019187 has 2 divisors, whose sum is σ = 20019188. Its totient is φ = 20019186.

The previous prime is 20019173. The next prime is 20019199. The reversal of 20019187 is 78191002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20019187 - 2⁷ = 20019059 is a prime.

It is not a weakly prime, because it can be changed into another prime (20019157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10009593 + 10009594.

It is an arithmetic number, because the mean of its divisors is an integer number (10009594).

Almost surely, 2^20019187 is an apocalyptic number.

20019187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20019187 is an equidigital number, since it uses as much as digits as its factorization.

20019187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 20019187 is about 4474.2806125678. The cubic root of 20019187 is about 271.5285364676.

The spelling of 20019187 in words is "twenty million, nineteen thousand, one hundred eighty-seven".